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Skeletonized Knockout Leaves and Early Black Spot: Dual Treatment Approach

Knockout leaves eaten to veins, with small brown spots on both sides.

Rose Slugs + Black Spot

Skeletonizing = rose slugworms (sawfly larvae). Brown spots = early black spot. Use a combination spray (e.g., Bayer Advanced) for both insects and fungus. Spray leaf undersides thoroughly where slugs feed.

Roses: Diagnosing Abnormal Rose Leaves: Light Green, Narrow, Shriveled Clusters; Black Spot on Roses: Identification, Myths & Effective Control; Rose Sawfly (Rose Slug) Damage: Identification and Control; Knockout Roses Dying After White Webby Substance: Mildew, Not Death; Sunburn vs. Mildew: Diagnosing Leaf Discoloration After Spring Pruning; Lacy Leaves on Knockout Roses: Sawfly (Rose Slug) Damage; Curling Leaves on Knock Out Roses: Multiple Possible Causes; Yellow Spots on Knockout Rose Leaves: Weather Stress, Not Disease; Holes in Knock Out Rose Leaves: Night-Feeding Insects; Knockout Rose Black Spot: Late Season Management in Zone 8

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